My dumbest moments were during crotas end when someone placed a trip mine on the ground outside of the ogre door, then proceeded to be killed by the mine he decided to place right below him. And one time we ran the dust palace nightfall with a random and the kid swore you had to kill all 3 of the bosses at the same time.
Edit 1: made the post destiny wide instead of strictly just raids, also added a "best of" where the dumbest gaurdian story's will be featured. Thanks to everyone who's shared their stories.
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Starting up warpriest hard we invited 2 more people to join who were squeakers. They were barking orders from the get go at totems. Not to mention they were dying left and right at 310+ light level. So warpriest spawns and kid say oh I'll be right back. He got slaughtered and we had to wipe. Who the hell leaves to get something when the boss spawns? Wtf. We beat him then kicked the 2 squeakers